What are the causes of surface defects in automotive parts?

I. Chaotic ripples on the surface of the circumference of the garden when precision turning the outer circle
Causes:
1.The raceway of spindle rolling bearing is worn.
2. The axial clearance of the spindle is too large.
3. The center bushing is not stable when the workpiece is cut with tailstock support.
4. When using chuck to hold the workpiece cutting test, because of the chuck flange hole screw text and the front end of the spindle centering axis shall be threaded with loose, and cause the workpiece is not sure, or the jaws into the shape of laholes, so that the workpiece clamping instability.
5. The four-sided tool holder is deformed by clamping the tool, causing the ground and the surface of the bottom plate of the upper cutting frame to contact poorly.
6. The gap between the sliding surfaces of the upper and lower tool holders (including the sliding plate) is too large.
7. Go tool box. The three supports of the sliding plate fine bracket are different axes, and the rotation is held back (stuck block phenomenon).
Solution: .
1. Replace the spindle rolling bearing.
2. Adjust the clearance of the thrust ball bearing at the back end of the spindle.
3. Check the tailstock top sleeve and shaft hole and clamping device, if it is out of action, can first repair the shaft hole.
4. Change the clamping method of the workpiece, and use the tailstock to support the cutting.
5. Scrape and repair the joint surface of the base plate of the square tool holder to make a uniform and comprehensive contact.
6.Adjust the plug iron pressure plate of all guideway subs to make it fit evenly and shake smoothly and lightly.
7. Check each support, if necessary, remove and reassemble.
Second, the surface of the outer circle of fine turning, every - - a fixed length repeatedly appear ripples

Causes:
1.The longitudinal walking knife pinion of the skate Factory direct sale truck spring 3030 chamberbrake t3030 parts of t30 brake chamber hino brake chamber box is not properly meshed with the rack.
2. The light bar is bent or the light bar. Wire rod, tool bar three installation holes are not in the same plane.
3. A drive gear in the skate box may be damaged, or incorrect pinch due to the knuckle diameter vibration bow| up.
4. Bed box, tool box in the shaft bending or gear damage.
Solution measures:
1. adjust the meshing gap, and make the gear rack in the tooth surface full width on the meshing table.
2. The light bar should be removed and straightened; assembly to keep the three holes coaxial and in the same plane.
3. Check and correct the transmission gear in the skate box, damage must be replaced.
4. Check the transmission shaft and gears, straighten the transmission shaft, and replace the damaged gears.